Samsung led monitor auto adjdustment is locked i cannot reset can u help

It sounds like you are in the Store Demo Mode. Turn it off and see if that fixes it.

https://www.manualslib.com/manual/145519/Samsung-Syncmaster-Fx2490hd.html?page=27

Reset

Reset Samsung FX2490HD LS24F9DSM to factory state

monitorsfaq.com https://www.monitorsfaq.com > Factory reset > Samsung
How to restore or reset Samsung FX2490HD LS24F9DSM. Reset to its factory state Samsung FX2490HD . How to hard reset monitor. Clear all settings or format.

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Do a factory reset .Below are a couple sites that will show how to do this
How to Reset Samsung LED TV to Factory Defaults How do perform Factory Data Reset on my Smart TV Samsung Support Australia samsung led smart tv factory reset

Hello Dear,
Type the code * 2767 * 3855 # and the phonewill reset to the factory settings. Other interestingcodes for Samsung phones: * # 0228 # BatteryInformation
* # 0673 # Test MP3
* # 0782 # Date and Time
* # 0842 # VibrationTest
* # 1111 # SoftwareVersion FTA
* # 1234 # Softwareversion (short)
* # 1235789 # StateControl of Integrity
Hardware Version * #2222 # FTA
* # 232337 # BluetoothBroadcast Address View
* # 32489 # State ofCiphering
* # 742695 # Softwareversion, Hardware Version, Date of Last Calibration Radiofrequency
(Equivalent to * # 8999* 8376263 #)
* # 8999 * 8376263 #Software version, Hardware Version, Date of Last Calibration Radiofrequency
(Equivalent to 742 695* # #) * # 1546792 * #Admin settings (WARNING: not to experiment!)
(* # * 73561 # OperatorCode, where applicable)
(* # 2456987 * # MasterKey) # * # 123580 TestMode main menu (not to experiment!, Equivalent to * # 9998 * 324 #)
* # 9998 * 324 # TestMode main menu (not to experiment!, Equivalent to * # 123580 #)
* # 0002 * 28346 # ItemMenu Handset Volume (sub-menu of the Test Mode Menu)
* # 0011 # NetworkConnection Status
(Same as in Test Mode,which not only returns to the main menu of the Test Mode)
* # 7412359 # Test MenuRadiofrequency
(Same as in Test Mode,which not only returns to the main menu of the Test Mode)
* # 9999 * 0 # NetworkMonitor
(Same as in Test Mode,which not only returns to the main menu of the Test Mode) * # 7465625 # setthe Phone List of Blocks # 7465625 * 27 *code # Remove the "PC Lock"
# 7465625 * 638 * Code# Remove the "Network Lock"
# 7465625 * 685 * Code# Remove the "Multi Lock"
# 7465625 * 746 * Code# Remove the "SIM Lock"
# 7465625 * 77 * code #Removes the "SP Lock"
# 7465625 * 782 * Code# Remove the "Subset Lock"
# 7465625 * 228 #Disable "Activa Lock"
# 7465625 * 2827 #Disable "Auto CP Lock"
# 7465625 * 28638 #Disable "Auto Network Lock"
# 7465625 * 28685 #Disable "Auto Multi Lock"
# 7465625 * 28746 #Disable "Auto SIM Lock"
# 7465625 * 2877 #Disable "Auto SP Lock"
# 7465625 * 28782 #Disable "Auto Subset Lock" Malicious code:
* 2767 * 3855 #Reset Full Phone (back as "just bought") * 7465625 * 27 *code # Set the "PC Lock"
* 7465625 * 638 * Code# Set the "Network Lock"
* 7465625 * 685 * Code# Set the "Multi Lock"
* 7465625 * 746 * Code# Set the "SIM Lock"
* 7465625 * 77 * code #Set the "SP Lock"
* 7465625 * 782 * Code# Set the "Subset Lock"
* 7465625 * 228 #Enable "Activa Lock" to restart the phone
* 7465625 * 2827 #Activate "Auto CP Lock" to restart the phone
* 7465625 * 28638 #Turn on "Auto Network Lock" to restart the phone
* 7465625 * 28685 #Turn on "Auto Multi Lock" to restart the phone
* 7465625 * 28746 #Turn on "Auto SIM Lock" to restart the phone
* 7465625 * 2877 #Activate "Auto SP Lock" to restart the phone
* 7465625 * 28782 #Turn on "Auto Subset Lock" to restart the phone These codes areworth a bit more for all Samsung phones, in particular: Samsung E390,Samsung Ultra Video F500, Samsung F510, Samsung F520, Samsung F700, Samsung SGHi520, Samsung i600, Samsung i620, Samsung L760, Samsung P910, Samsung P920,Samsung P940, Samsung SCHB100, Samsung SGH F600, Samsung SGH i550, Samsung SGHJ750, Samsung SGH I600, SGH i607 Samsung Blackjack, Samsung SGH P930, SamsungSGH Z630, Samsung Ultra Edition 12.1 (U700), Samsung Z100, Samsung Z105u,Samsung Z107V, Samsung Z110, Samsung Z130, Samsung Z140, Samsung Z140V, SamsungZ150, Samsung Z170, Samsung Z220, Samsung Z230, Samsung Z300, Samsung Z310, SamsungZ320, Samsung Z330, Samsung Z350, Samsung Z360, Samsung Z370, Samsung Z400,Samsung Z500, Samsung Z510, Samsung Z520, Samsung Z540, Samsung Z550 , SamsungZ560, Samsung Z600, Samsung Z610, Samsung Z620, Samsung Z650i, Samsung Z700,Samsung Z710, Samsung Z720, Samsung ZV10, Samsung ZV30, Samsung ZV40, SamsungZV50, Samsung ZV60, Samsung ZX10, Samsung ZX20. WARNING: Someof these codes may cause blockage or malfunction of the cell, therefore, it isunderstood that you use them at your own risk.

First, make sure this isn't coming from your signal source; these items are not listed in any of the functions described in the manual for your monitor.
If disconnecting, changing or turning off your signal source doesn't get rid of the control item display, try resetting the monitor (maybe the display has some extra firmware features not in the documentation):

1. Press the Menu button on the side of the monitor.
2. From the On-Screen Display, navigate to the Setup&Reset menu using the arrow buttons, then press the Source/Select button.
3. Navigate to "Reset" and select it.

This should restore everything to the factory default setting and get the TV/monitor out of whatever mode it's in.

OSD Lock & Unlock
When pressing the AUTO button after locking the OSD
When pressing the MENU button after locking the OSD
This is the function that locks the OSD in order to keep the current states of settings or prevent others
from adjusting the current settings.
Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment
lock function.
Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment
lock function.
Please leave rating if it helps.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Hi

If you use any kind of LCD monitors for example Samsung or LG or BenQ, you'll see each and every monitor has their auto adjustment of the monitor's resolution. Many people really find it difficult to adjust when it gets locked.

First find you auto button of your monitor

(It should be beside the power button)

Press and hold the button until the box disappears..

Now just press the auto button. It should have unlocked by now.

THANKS....

With Regards......

Vaishu

hi mate.,push enter key for 30 seconds it will reset to factory mode.. but for me no key working.

this monitor series has bad buttons,I replaced my whole buttons panell and it is ok now.

Samsung Secret Codes
*2767*688# = Unlocking Code
*#8999*8378# = All in one Code

*#7465625# = Check the locks
*7465625*638*Code# = Enables Network lock
#7465625*638*Code# = Disables Network lock
*7465625*782*Code# = Enables Subset lock
#7465625*782*Code# = Disables Subset lock
*7465625*77*Code# = Enables SP lock
#7465625*77*Code# = Disables SP lock
*7465625*27*Code# = Enables CP lock
#7465625*27*Code# = Disables CP lock
*7465625*746*Code# = Enables SIM lock
#7465625*746*Code# = Disables SIM lock
*7465625*228# = Activa lock ON
#7465625*228# = Activa lock OFF
*7465625*28638# = Auto Network lock ON
#7465625*28638# = Auto Network lock OFF
*7465625*28782# = Auto subset lock ON
#7465625*28782# = Auto subset lock OFF
*7465625*2877# = Auto SP lock ON
#7465625*2877# = Auto SP lock OFF
*7465625*2827# = Auto CP lock ON
#7465625*2827# = Auto CP lock OFF
*7465625*28746# = Auto SIM lock ON
#7465625*28746# = Auto SIM lock OFF

*2767*3855# = E2P Full Reset
*2767*2878# = E2P Custom Reset

Samsung implements protection into their monitors, which allows to block all settings except brightness and contrast. This "Locked" mode turns on by pressing and holding 'Menu' button for 5 seconds, and turns off by pressing and holding 'Enter' button for 5 sec.